EP3611480B1 - Ultraschallflussmesser - Google Patents

Ultraschallflussmesser Download PDF

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Publication number
EP3611480B1
EP3611480B1 EP18189560.8A EP18189560A EP3611480B1 EP 3611480 B1 EP3611480 B1 EP 3611480B1 EP 18189560 A EP18189560 A EP 18189560A EP 3611480 B1 EP3611480 B1 EP 3611480B1
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Prior art keywords
flight
time
transducer
microcontroller
flow meter
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English (en)
French (fr)
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EP3611480A1 (de
Inventor
Virgilijus Pamakstis
Rimas Wolyniec
Gintautas Lengvinas
Vainius Repsys
Arminas Ragauskas
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Axioma Metering Uab
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Axioma Metering Uab
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves

Definitions

  • the present invention relates to an ultrasonic flow meter. More specifically, the invention relates a flow meter employing two ultrasound transducers with a reflector assembly that are employed to obtain various sequences of time-of-flight measurements to accurately calculate flow.
  • ultrasonic flow meters are devices that measure the velocity of a fluid, such as water, flowing therethrough with ultrasound to calculate the volumetric flow rate of the fluid. Often, these flow meters accomplish this by measuring the difference between the time-of-flight of ultrasonic pulses transmitted upstream and downstream relative to the direction of fluid flow.
  • Patent document US 4 232 548 A discloses an ultrasonic flowmeter in which multiple transmission sequences are emitted and different zero cross-over points are used for processing each sequence.
  • a flow meter that can adapt for a zero-drift effect.
  • a flow meter that can adapt for dynamic changes in the fluid supply.
  • the invention comprises a an ultrasonic flow meter for measuring the flow of a fluid, including a flow tube through which a fluid to be measured flows, a first transducer positioned to transmit an ultrasonic pulse through the fluid flowing through the flow tube, a second transducer positioned to transmit another ultrasonic pulse through the fluid flowing through the flow tube, and a reflector assembly disposed in the flow tube, the reflector assembly configured to reflect the ultrasonic pulse transmitted by the first transducer to the second transducer to provide an upstream pulse having an upstream time time-of-flight, and to reflect the ultrasonic pulse transmitted by the second transducer to the first transducer to provide a downstream pulse having a downstream time-of-flight.
  • a microcontroller is in communication with the first and second transducers such that the microcontroller causes the first and second transducers to transmit the upstream and downstream ultrasonic pulses and generates a measurement of the upstream time-of-flight and the downstream time-of-flight, and the microcontroller obtains a plurality of sequences of said measurement, each sequence comprising at least three measurements of the upstream and downstream time-of-flights, the at least three measurements being of the same measurement type selected from the group of: (a) the time between consecutive rising edges of a pulse emitted from the first transducer and reflected by the reflector assembly to the second transducer, and the time between consecutive rising edges of a subsequent pulse emitted from the second transducer and reflected by the reflector assembly to the first transducer, (b) the time between consecutive falling edges of a pulse emitted from the second transducer and reflected by the reflector assembly to the first transducer, and the time between consecutive falling edges of a subsequent pulse emitted from the first transduc
  • the microcontroller For each of the plurality of sequences, the microcontroller filters said sequence by removing the longest time-of-flight and the shortest time-of-flight from the upstream time-of-flights in said sequence, and removing the longest time-of-flight and the shortest time-of-flight from the downstream time-of-flights in said sequence.
  • the microcontroller calculates the average upstream time-of-flight from the remaining upstream time-of-flights in the plurality of sequences, and calculates the average downstream time-of-flight from the remaining downstream time-of-flights in the plurality of sequences, after filtering said plurality of sequences; and the microcontroller further calculates the volumetric flow rate based on the average upstream time-of-flight and the average downstream time-of-flight.
  • the microcontroller obtains a sequence employing measurement type (a), a sequence employing measurement type (b), a sequence employing measurement type (c), and a sequence employing measurement type (d).
  • each sequence obtained by the microcontroller comprises five measurements of the upstream and downstream time-of-flights. In other embodiments, each sequence obtained by the microcontroller comprises seven measurements of the upstream and downstream time-of-flights, and wherein, for each of the plurality of sequences, the microcontroller further removes the second longest time-of-flight and the second shortest time-of-flight from the upstream time-of-flights in said sequence, and further removes the second longest time-of-flight and the second shortest time-of-flight from the downstream time-of-flights in said sequence.
  • the reflector assembly includes a reflector housing disposable in the flow tube, the reflector housing comprising a bottom portion having a middle, first and second ends, a first reflecting surface at the first end and inclined toward the middle, and a second reflecting surface at the second end and inclined toward the middle, and a top portion having a third reflecting surface positioned such that the third reflecting surface reflects the ultrasonic pulses transmitted by the first transducer, and reflected by the first reflecting surface, to the second reflecting surface, and the third reflecting surface reflects the ultrasonic pulses transmitted by the second transducer and reflected by the second reflecting surface to the first reflecting surface.
  • the bottom and top portions have arcuate inner walls that together define a substantially circular channel in the reflector housing.
  • the first end of the bottom portion of the reflector assembly has a notch, and wherein the flow tube has an inner wall with a protuberance that engages the notch when the reflector assembly is inserted in the flow tube.
  • the first, second, and third reflecting surfaces comprise stainless-steel.
  • the first and second reflecting surfaces are affixed to the bottom portion of the reflector housing via overmolding.
  • the invention flow meter further includes a housing in which the first and second transducers and the microcontroller are disposed, the housing having an upper surface along the perimeter thereof with a groove therein, and a cover having a protuberance along the perimeter thereof disposed in the groove, wherein the protuberance is secured in the groove with an ultraviolet-cured glue.
  • the first and second transducers comprise piezoceramic discs.
  • the flow tube does not have a temperature measurement channel.
  • the microcontroller causes the first and second transducers to transmit the upstream and downstream ultrasonic pulses and generates a measurement of the upstream time-of-flight and the downstream time-of-flight every 500 milliseconds.
  • the microcontroller calculates the ultrasound velocity based on the calculated flow rate, and in some of these cases, the microcontroller calculates the temperature of the fluid based on the calculated ultrasound velocity.
  • FIG. 1 The basic components of one embodiment of an ultrasonic flow meter in accordance with the invention are illustrated in Figure 1 .
  • the terms “top,” “bottom,” “above,” “below,” “over,” “under,” “above,” “beneath,” “on top,” “underneath,” “up,” “down,” “upper,” “lower,” “front,” “rear,” “back,” “forward” and “backward” refer to the objects referenced when in the orientation illustrated in the drawings, which orientation is not necessary for achieving the objects of the invention
  • FIGS. 1A-B illustrate one exemplary embodiment of a flow meter (20) in accordance with the invention.
  • the illustrated flow meter (20) includes a flow tube (24), through which water or another liquid flow, and a housing (28) coupled thereto, which houses an electronic system for performing various measurements, as further explained below.
  • the housing (28) includes a cavity (30) for accommodating the electronic systems, which is enclosed by a cover (32) in order to protect the electronic components and sensors therein from the atmosphere and surrounding water and vapor.
  • the cover (32) has translucent areas (40) and (42), which serves as an LCD display.
  • the top of the housing includes a groove (34) around the perimeter thereof, and the cover has a corresponding protuberance (36) that fits in the groove (34).
  • the groove (34) includes an adhesive (38), such as glue, for securing the cover (32) to the housing (28) and ensuring that the enclosure is sealed. By securing the cover (32) with the glue, unauthorized access to the device is also prevented.
  • the cover (32) includes a transparent portion (44), which is covered with a colored portion (46), such that the side (48) of the cover is transparent.
  • the glue (38) can be cured rapidly with ultraviolet light.
  • a first (top) printed circuit board (50) is positioned below the cover (32).
  • the circuit board (50) includes a microcontroller (52) for managing various functions, including near field communication, radio communication, optical communication, flash memory storage, and generation of the LCD display. Power is supplied by batteries (54), which are soldered directly to the circuit board (50) in order to avoid risking poor quality electrical contact.
  • a radio antenna (56) made from a printed circuit board is located between the circuit board (50) and cover (32) and is connected to the board (50) via a pin connector.
  • a second (bottom) printed circuit board (60) for performing time-of-flight measurements is also provided.
  • the second circuit board (60) includes first and second ultrasonic transducers (62), (64).
  • the transducers (62), (64) can comprise piezoceramic discs, which are connected to the circuit board (60) via a flexible wire connection, as described below.
  • the first and second printed circuit boards (50), (60) are disposed within the cavity (30) of the housing (28) and connected with a flexible or rigid connector.
  • board (60) is mounted in the housing (28)
  • the surface (66) to which the transducers (62), (64) are soldered is cleaned via treatment with atmospheric plasma, and each bonding surface is then covered with a piezoceramic disc (68).
  • One side of the disc (68) is connected to the circuit board (60) via a flexible joint (70), which minimizes the mechanical stress thereon resulting from the fact that the thermal expansion parameters of the printed circuit board (60) and the plastic of the housing (28) are different.
  • the other side of the disc (68) is bonded to the wall of the flow tube (24).
  • the thickness of the wall of the flow tube (24) where the transducers (62), (64) reside is tuned to the transducer frequency.
  • Each transducer (62), (64) is secured in place by melting plastic positioning pins (76).
  • the top circuit board (50) is likewise secured in place via plastic pins (78).
  • the assembly (80) includes a housing with a bottom portion (82) and a top portion (84), which can be made of molded plastic.
  • the bottom portion (82) has a first end (86), a second end (88), and a middle therebetween.
  • a reflector located at the first end (86) has a first reflecting surface (92) inclined toward the middle of the bottom portion (82), while second reflector located at the second end (88) has a second reflecting surface (94), also inclined toward the middle of the bottom portion (82).
  • the top portion (84) includes a third reflector providing a third reflecting surface (96) for reflecting ultrasonic pulses from the first and second reflecting surfaces (92), (94), as further described below.
  • the first, second, and third reflectors may each comprises a stainless-steel reflector affixed to the bottom and top portions (82), (84) via overmolding.
  • the reflector assembly (80) is assembled by bringing together the top and bottom portions (82), (84) and fitting protuberances (86) on one portion into corresponding apertures (88) of the other portion.
  • ribs on the bottom and top portions (82), (84) collectively provide an elongated projection (100).
  • the inner wall of the flow tube (24) includes a channel (102) for accommodating the projection (100) such that, when the reflector assembly (80) is inserted into the flow tube (24), the bottom and top portions (82), (84) are secured together.
  • the flow tube (24) may also include a projection (104) for engaging an aperture (105) of the reflector assembly (80), as shown in FIG. 7A .
  • the bottom portion (82) has a notch (106) on the underside thereof, and the bottom surface of the flow tube (24) has a corresponding protuberance (108) for engaging the notch (106) and acting as a stop to prevent the reflector assembly (80) from moving in the flow tube (24) as fluid flows therethrough.
  • the bottom portion (82) and the top portion (84) have arcuate inner walls such that, when assembled together, they define a substantially circular channel in the reflector housing.
  • the first transducer (62) is positioned above the first inclined reflecting surface (92), and the second transducer (64) is positioned above the second inclined reflecting surface (94).
  • the operation of the transducers (62), (64) and reflector assembly (80) is illustrated in FIG. 11 .
  • the first transducer (62) emits an ultrasonic pulse, it is transmitted along a path A, in which it is reflected by the first reflecting surface (92) to the third reflecting surface (96), which reflects it to the second reflecting surface (94), which reflects it to the second transducer (64).
  • the microcontroller (52) is able to make an upstream time-of-flight measurement.
  • the microcontroller (52) is able to also make a downstream time-of-flight measurement.
  • the microcontroller Each 0.5 seconds, the microcontroller "wakes up” (200).
  • the microcontroller performs a measurement procedure (210), comprising one upstream time-of-flight and one downstream time-of-flight, as further described below.
  • the microcontroller then services various components, which includes LDC service (220), archive service (230), real time clock service (240), radio communication service (250), near field communication service (260), and optical communication service (270).
  • the microcontroller (52) then enters sleep mode (280) in order to minimize power consumption.
  • FIGS. 13A-B illustrate the manner in which the microcontroller (52) conducts each measurement procedure in one advantageous embodiment of the invention.
  • the microcontroller obtains four sequences of measurements (M0 through M3). For each sequence, the microcontroller obtains N measurements, where each measurement is one upstream time-of-flight and one downstream time-of-flight, and stores this in memory.
  • Measurement Type Ultrasound Transducer Pulse Order Edge 1 1 ->2 short pause (16-20 ms) 2->1 rising 2 2 ->1 short pause (16-20 ms) 1->2 falling 3 2 ->1 short pause (16-20 ms) 1->2 rising 4 1 ->2 short pause (16-20 ms) 2->1 falling
  • N is at least three, but typically, is five or seven. In the illustrated embodiment, N is five.
  • the microcontroller wakes up and initiates the measurement procedure (300).
  • the microcontroller confirms that M is 0 (310) and confirms that N is not 0 (320). It then initiates a measurement of Type 1 (330), and reads and stores the measurement (340). It then decreases the value of N by one (350), and ends the current measurement procedure (500), entering sleep mode.
  • the microcontroller When the microcontroller wakes up again (which it does every 500 ms), it again initiates the measurement procedure. It repeats the same steps, again decreasing the value of N by one (350). In the illustrated example, N is five. Therefore, after the microcontroller has completed the measurement procedure five times, when it checks if N is 0 (320), the answer will be 'yes,' and the microcontroller will change the sequence M to 1 and reset N to 5 (325), and then begin the next sequence (M1).
  • the microcontroller After checking the values of M and N (410, 420), the microcontroller initiates a measurement of Type 2 (430). The microcontroller reads and stores the measurement (440). It then decreases the value of N by one (450), and ends the current measurement procedure (500), entering sleep mode. As with the prior sequence, the microcontroller repeats these steps each time it wakes until the value of N is 0, at which point, it again resets the values of M and N (425) and moves on to the next sequence (M2).
  • the microcontroller repeats the same steps using measurements of Type 3 until it moves onto the final sequence (M3). After it completes the final sequence using measurements of Type 4, it resets the value of M to 0 (625) so that the system is ready to repeat the above, and then calculates the result (700).
  • the microcontroller first filters (800) the results of each of the sequences.
  • the microcontroller does this by removing the longest time-of-flight and the shortest time-of-flight from the upstream time-of-flights in that sequence, and similarly, removing the longest time-of-flight and the shortest time-of-flight from the downstream time-of-flights in the sequence.
  • each sequence will include five measurements (both upstream and downstream).
  • the filtering will typically (though not necessarily) comprise removing just the longest time-of-flight and the shortest time-of-flight.
  • each sequence will include seven measurements.
  • the filtering will typically (though not necessarily) comprise removing the two longest and the two shortest time-of-flights.
  • the microcontroller (52) calculates (810) the average upstream time-of-flight from the remaining upstream time-of-flights and calculates the average downstream time-of-flight from the remaining downstream time-of-flights. The microcontroller then calculates (820) the volumetric flow in two steps.
  • flow RAW Q f ⁇ TimeUp ⁇ TimeDown TimeUp ⁇ TimeDown
  • the microcontroller (52) calculates (830) the ultrasound velocity based on the calculated flow rate, and then calculates (840) the temperature of the fluid based on the calculated ultrasound velocity.
  • the flow tube (24) does not have a temperature measurement channel since the temperature can be calculated indirectly from the time-of-flight measurements, thereby saving space and reducing the number of components.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Claims (15)

  1. Ein Ultraschallflussmesser (20) zur Messung des Durchflusses einer Flüssigkeit, der umfasst:
    ein Durchflussrohr (24), durch das die zu messende Flüssigkeit fließt;
    ein erster Wandler (62), so positioniert, dass er einen Ultraschallimpuls durch die durch das Durchflussrohr fließende Flüssigkeit überträgt;
    einen zweiten Wandler (64), so positioniert, dass er einen weiteren Ultraschallimpuls durch die durch das Durchflussrohr fließende Flüssigkeit überträgt;
    einen Mikrocontroller (52), der in Verbindung mit dem ersten und zweiten Wandler steht, so dass der Mikrocontroller den ersten und zweiten Wandler dazu veranlasst, die Aufwärts- und Abwärts- Ultraschallimpulse zu übertragen und eine Messung der Aufwärts- Laufzeit und der Abwärts- Laufzeit durchzuführen;
    wobei der Mikrocontroller eine Vielzahl von Sequenzen (MO durch M3) |dieser Messung erhält, wobei jede Sequenz mindestens drei Messungen der Aufwärts- und Abwärts- Laufzeiten enthält, bei den mindestens drei Messungen handelt es sich um denselben Messtyp, ausgewählt aus der Gruppe:
    (a) der Zeit zwischen aufeinanderfolgenden steigenden Flanken eines vom ersten Wandler gesendeten Impulses und reflektiert von der Reflektoranordnung an den zweiten Wandler, und der Zeit zwischen aufeinanderfolgenden steigenden Flanken eines folgenden Impulses, gesendet vom zweiten Wandler und reflektiert von der Reflektoranordnung an den ersten Wandler,
    (b) der Zeit zwischen aufeinanderfolgenden fallenden Flanken eines vom zweiten Wandler gesendeten und von der Reflektoranordnung an den ersten Wandler reflektierten Impulses, und der Zeit zwischen aufeinanderfolgenden fallenden Flanken eines folgenden Impulses, gesendet vom ersten Wandler und reflektiert von der Reflektoranordnung an den zweiten Wandler,
    (c) der Zeit zwischen aufeinanderfolgenden steigenden Flanken eines vom zweiten Wandler gesendeten Impulses, reflektiert von der Reflektoranordnung an den ersten Wandler, und der Zeit zwischen aufeinanderfolgenden steigenden Flanken eines folgenden Impulses, gesendet vom ersten Wandler und reflektiert von der Reflektoranordnung an den ersten Wandler,
    (d) der Zeit zwischen aufeinanderfolgenden fallenden Flanken eines vom ersten Wandler gesendeten Impulses, reflektiert von der Reflektoranordnung an den zweiten Wandler, und der Zeit zwischen aufeinanderfolgenden fallenden Flanken eines folgenden Impulses, reflektiert vom zweiten Wandler und reflektiert von der Reflektoranordnung an den ersten Wandler,
    wobei sich der Typ der Laufzeitmessung jeder dieser Sequenzen vom Typ der Laufzeitmessungen der erwähnten anderen Sequenzen unterscheidet; und
    dadurch gekennzeichnet, dass eine Reflektoranordnung (80) im Durchflussrohr angeordnet ist, die Reflektoranordnung ist dabei dazu konfiguriert, den Ultraschallimpuls zu reflektieren, der vom ersten Wandler an den zweiten Wandler übertragen wird, um einen Aufwärtsimpuls mit einer Aufwärts- Laufzeit zu erzeugen und den Ultraschallimpuls zu reflektieren, der vom zweiten Wandler an den ersten Wandler übertragen wird um einen Abwärtsimpuls mit einer Abwärts Laufzeit zu erzeugen;
    für jede der verschiedenen Sequenzen filtert der Mikrocrocontroller diese Sequenz heraus, indem die längste Laufzeit und die kürzeste Laufzeit aus der Aufwärts-Laufzeit in dieser Sequenz entfernt werden und die längste Laufzeit und die kürzeste Laufzeit aus der Abwärts- Laufzeit in dieser Sequenz entfernt werden, und
    wobei der Mikrocontroller die durchschnittliche Aufwärts- Laufzeit aus der verbleibenden Aufwärts-. Laufzeit in den verschiedenen Sequenzen berechnet,
    und die durchschnittliche Abwärts- Laufzeit aus der verbleibenden Abwärts-Laufzeit in den verschiedenen Sequenzen berechnet, nach Filtern der erwähnten verschiedenen Sequenzen; und
    wobei der Mikrocontroller den Volumenstrom auf Grundlage der durchschnittlichen Aufwärts- Laufzeit und der durchschnittlichen Abwärts- Laufzeit berechnet.
  2. Der Ultraschallflussmesser nach Anspruch 1, wobei der Mikrocontroller eine Sequenz erhält, die den Messtyp (a) verwendet, eine Sequenz, die den Messtyp (b)verwendet, eine Sequenz, die den Messtyp (c) verwendet, und eine Sequenz, die den Messtyp (d) verwendet.
  3. Der Ultraschallflussmesser nach Anspruch 1 oder 2, wobei jede vom Mikrocontroller erhaltene Sequenz fünf Messungen der Aufwärts- und Abwärts-Laufzeit umfasst.
  4. Der Ultraschallflussmesser nach Anspruch 1 oder 2, wobei jede vom Mikrocontroller erhaltene Sequenz sieben Messungen der Aufwärts- und Abwärts-Laufzeit, enthält und wobei für jede der Vielzahl von Sequenzen der Mikrocontroller außerdem die zweitlängste Laufzeit und die zweitkürzeste Laufzeit aus der Aufwärts- Laufzeit in dieser Sequenz entfernt und außerdem die zweitlängste Laufzeit und die zweitkürzeste Laufzeit aus der Aufwärts- Laufzeit in dieser Sequenz entfernt.
  5. Der Ultraschallflussmesser nach Anspruch 1, wobei die Reflektoranordnung ein Reflektorgehäuse umfasst, das im Durchflussrohr untergebracht werden kann, wobei dieses Reflektorgehäuse enthält:
    ein Bodenabschnitt, mit einem mittleren, ersten und zweiten Endstück, eine erste reflektierende Fäche am ersten Endstück und zur Mitte hin geneigt, und eine zweite reflektierende Fäche am zweiten Endstück und zur Mitte hin geneigt, und
    ein oberer Abschnitt mit einer dritten reflektierenden Fläche, so angeordnet, dass die dritte reflektierende Fläche den vom ersten Wandler übertragenen und von der ersten reflektierenden Fläche reflektierten Ultraschallimpuls an die zweite reflektierende Fläche reflektiert, und die dritte reflektierende Fläche den vom zweiten Wandler übertragenen und von der zweiten reflektierenden Fläche reflektierten Ultraschallimpuls reflektiert.
  6. Der Ultraschallflussmesser nach Anspruch 5, wobei die unteren und oberen Abschnitte bogenförmige Innenwände haben, die zusammen einen im Wesentlichen ringförmigen Kanal im Reflektorgehäuse definieren.
  7. Der Ultraschallflussmesser nach Anspruch 5, wobei das erste Ende des unteren Abschnitts der Reflektoranordnung eine Kerbe aufweist, und wobei das Durchflussrohr eine Innenwand mit einer Ausstülpung aufweist, die in die Kerbe greift, wenn die Reflektoranordnung in das Durchflussrohr eingesetzt wird.
  8. Der Ultraschallflussmesser nach Anspruch 5, wobei die erste, zweite und dritte reflektierende Fläche Edelstahl enthält.
  9. Der Ultraschallflussmesser nach Anspruch 5, wobei die erste und zweite reflektierende Fläche am unteren Abschnitt des Reflektorgehäuses durch Umspritzen befestigt sind.
  10. Der Ultraschallflussmesser nach Anspruch 1, weiterhin umfassend:
    ein Gehäuse, in dem der erste und zweite Wandler und der Mikrocontroller angeordnet sind, wobei das Gehäuse eine obere Fläche enthält, mit einer darin enthaltenen, über den Umfang verlaufenden Nut; und
    einen Deckel, mit einer Ausstülpung über den Umfang, angeordnet in der Nut, wobei die Ausstülpung in der Nut mit einem UV-Aushärtungsklebstoff gesichert ist.
  11. Der Ultraschallflussmesser nach Anspruch 1, wobei die ersten und zweiten Wandler piezokeramische Scheiben enthalten.
  12. Der Ultraschallflussmesser nach Anspruch 1, wobei das Durchflussrohr keinen Temperaturmesskanal enthält.
  13. Der Ultraschallflussmesser nach Anspruch 1, wobei der Mikrocontroller den ersten und zweiten Wandler dazu veranlasst, die Aufwärts- und Abwärts-Ultraschallimpulse zu übertragen und alle 500 Millisekunden eine Messung der Aufwärts- Laufzeit und der Abwärts- Laufzeit durchzuführen.
  14. Der Ultraschallflussmesser nach Anspruch 1, wobei der Mikrocontroller die Ultraschallgeschwindigkeit auf Basis der berechneten Durchflussrate berechnet.
  15. Der Ultraschallflussmesser nach Anspruch 14, wobei der Mikrocontroller die Temperatur der Flüssigkeit auf Basis der berechneten Durchflussrate berechnet.
EP18189560.8A 2018-08-17 2018-08-17 Ultraschallflussmesser Active EP3611480B1 (de)

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CN111473827B (zh) * 2020-05-28 2022-04-01 宁波大学 V形声道零飘消除方法
FR3114388B1 (fr) * 2020-09-22 2022-11-11 Integra Metering Sas Procédé de mesure de débit d’un fluide dans une canalisation
FR3114387B1 (fr) * 2020-09-22 2023-01-20 Integra Metering Sas Procédé de mesure de débit d’un fluide dans une canalisation
WO2022079213A1 (de) * 2020-10-14 2022-04-21 Gwf Messsysteme Ag Durchflussmesser
IT202200003077A1 (it) * 2022-02-18 2023-08-18 Pietro Fiorentini Spa Dispositivo perfezionato per la misura di un fluido, preferibilmente di un gas.

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US4232548A (en) * 1979-03-01 1980-11-11 Joseph Baumoel Liquid flow meter
US5163445A (en) * 1987-04-10 1992-11-17 Cardiometrics, Inc. Apparatus, system and method for measuring spatial average velocity and/or volumetric flow of blood in a vessel and screw joint for use therewith
US20070151363A1 (en) * 2005-12-30 2007-07-05 Honeywell International Inc. Non-invasive sensing technique for measuring gas flow and temperature
JP5914870B2 (ja) * 2012-06-28 2016-05-11 パナソニックＩｐマネジメント株式会社 流体計測装置
US10107660B2 (en) * 2014-07-21 2018-10-23 Apator Miitors Aps Flow conduit insert

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